Athletic shoe calk



Dec.

F. c. PHILLIPS ATHLETIC SHOE CALK Filed Aug. 7, 1947 h l lw y Patented Dec. 11,1951

UNI-TED sums PATENT OFFICE-r ATHLETIC SHOE CALK I Fred C..;Ph,illips, Stoughton, Mass. Application linguist '1, 1947, SerialNb. 766,955

2 Claims.

This invention relates to an athletic shoe calk adapted to screw into a socket member set in the sole or heel of the shoe, and to a method of making such calks. It is an object of the invention to provide a calk which is of a type described and illustrated in Patent No. 1,827,514, granted to Daniel J. Golden on October 13, 1931. but which is superior in construction and can be more easily and cheaply manufactured. Calks of this description are made with a plate or disk adapted to bear against the tread surface of a shoe. A threaded stud projects axially from one face of the plate to engage a threaded socket member embedded in the shoe sole or heel. Projecting axially from the other face of the plate is the ground-penetrating portion of the calk which may be a tapered spike or any other desired form.

According to the present invention, the calk is made in two separate parts which are assembled to complete the structure. One of the parts is the disk which may conveniently be stamped from a sheet of suitable metal such as soft steel. The other part is the axial member which includes the threaded stud and the tapered spike. This second member is preferably case-hardened to increase the strength and wearing qualities of the spike. For a more complete understanding of the invention, reference may be had to the following description thereof and to the drawing, of Which- Figure 1 is a perspective view, partly broken away, of a blank from which the plate member is made;

Figure 2 is a perspective view of the axial member of the calk;

Figure 3 is a transverse, sectional view of the finished plate;

Figure 4 is a sectional view of the assembled calk; and

Figure 5 is a fragmentary, sectional view of a shoe sole on which a complete calk is mounted.

The calk embodying the invention consists of two separately made members, one of which is a disk or plate which can be stamped from a sheet of suitable material-such as soft steel, as shownin Figure 1. At the same time, a central aperture I2 and two small holes l4 may be punched in the blank, the holes l4 being for the purpose of receiving the pins of a pin wrench or similar tool by which the calk is screwed into place on a shoe sole, as hereinafter described.

After the flat blank for the plate if] has been stamped from a sheet, it is swaged by the use of a suitable die so as to give it a dished form, as indicated in Figure 3. As a result of this swaging operation, the blank assumes a saucer shape having a raised rim [6 which presses into the shoe sole when the spike is secured thereto. The swaging operation also serves to deform the sidewalls I8 of the central aperture 12 so that these side walls are given a slight taper.

The axial member 20 of the calk, which is illustrated in Figure 2, can be conveniently made from rod stock by the use of suitable turning tools and a screw threading die. This member comprises a central portion 22 which is slightly tapered and is of a size to enter the aperture 12 with a drive fit. The edge of the portion 22 is preferably knurled with sharp ridges which cut channels in the wall [8 of the aperture l2 when the member is driven into place in the aperture [2.

The upper part of the axial member 20 is a screw-threaded'stud 24 adapted to be screwed into a threaded socket 26 in an anchoring member 28 which may be mounted in the outsole 3% of a shoe, as indicated in Figure 5. Immediately below the central portion 22 the axial member 2t has a flange 32 of somewhat larger diameter than the portion 22 so that a shoulder 34 is formed which engages against a lower face of the plate [0 when the calk is assembled. Projecting downward below the flange 34 is the ground-penetrating element 36 which may be of any desired shape, a frusto-conical shape being shown in Figure 4. The axial member 20 is preferably case-hardened after it has been suitably shaped, to give it superior wearing qualities. This hardening process also enables the knurling on the central portion 22 to cut more readily into the wall l8 of the aperture l2 so that the two parts of the calk are thus locked against relative rotation.

When the threaded stud 24 is screwed into the socket 26, it is evident that the resulting upward tension on the axial member 20 tends to press the shoulder 34 against the plate Ill and to keep the two parts of the calk from separating or working loose.

I claim:

1. A calk for an athletic shoe or the like, comprising a metal plate having a central aperture, and an axial member of harder material than that of the plate extending through said aperture, said member having a knurled central portion engaging the walls of said aperture with a driving fit, said member having a flange adjoining said central portion engaging the lower face of the plate around the aperture, said member also including a tapered spike projecting down from said flange and a threaded stud projecting up from said central portion.

2. A calk for an athletic shoe or the like, com- ,prising a disk with a central aperture, and an axial member extending through said aperture, said member having a screw-threaded portion at its upper end, a knurled central portion tapering upwardly and engaging the walls of said aperture with a drive fit, a flange below said knurled portion having a shoulder bearing on the lower face of the disk, and a downwardly tapering spike portion at its lower end.

FRED C. PHILLIPS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 21,173 Fuller Aug. 8, 1939 736,121 Lipscomb Aug. 11, 1903 928,947 Dawson July 27, 1909 1,948,885 Riddell Feb. 27, 1934 1,982,588 Bartel Nov. 27, 1934 2,274,559 Nitkey Feb. 24, 1942 2,290,792 Abbott July 21, 1942 FOREIGN PATENTS Number Country Date 533,102 Great Britain Feb. 6, 1941 

